Comorbidity for Dyslexia and Attention Deficit Hyperactivity Disorder ADHD

The above bivariate genetic analyses have also been performed for reading deficits and ADHD. ADHD has commonly been diagnosed in the United States by asking teachers and/or parents to rate their children on a list of symptoms for attention deficits and hyperactivity. If a sufficiently high number of symptoms are checked, the children are categorized as ADHD. Researchers in the United States have noted a high rate of ADHD among children with dyslexia, ranging from about 20% to 40% across studies. We now have evidence from the Colorado twin study that part of this comorbidity is due to shared genetic influences, particularly for dyslexia and the attention-deficit symptoms (Willcutt et al., 2002).

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